It's a fairly common practice relocating an AFM to cold-side piping when upgrading turbos, especially for those who prefer not to/can't use an ECU like a d-jetro or an EMS 8860 which do away with the AFM and run a MAP sensor.
Haven't heard of many cases where the joiner has blown off the AFM, but I suppose it does make it susceptible given it clamps onto a flat surface.
Edit: Also, to the OP, is this a high mount setup or on a low mount?